Pressure bar for veneer machines



May 12, 1931 .l G. H. osGooD 1,804,704/

PRESSURE BAR'FOR VENEER MACHINES Filed June '7, 1950 /5 Fig a George H. Osgood..

Patented May 12, 1931 TED sra S GEORGE I-I. OSC-OOD, OF TACOMA, WASHINGTON PRESSURE BAR FOR VENEER MACHINES App1ication filed .Tune 7,

This invention relates to those. pressure bars for veneer machines having a rotary Contact member, or nose piece, and has special reference to the means for lubricating '5 the said rotary pressure member. The objects of my invention are to provide an economical and effective means of supplying the said rotary member with lubricant, and to distribute such lubricate evenly along its enfJ tire length.

I attain these and other objects by the devices, and arrangements illustrated in the accompanying drawings, in which- Fig. l is a vertical cross-section of a pressure bar in which the rotary nose member has its bearings in a horizontal and an inclined plane, and showing the means for lubricat` ing the nose along its entire length; Fig. 2 is a similar view showing a variation in the 2.@ lubricating means as used when the bearings for the rotary nose member are mounted in the horizontal plane; Fig. 3 is a front view,

on a small scale, showing the lubricating means largely in diagrammatic form; and

2 Fig. t is a section on the line 4.--4 in Fig. 1,'

of the end of the oil cavity, showing the plug therein.

Similar numerals of reference refer to similar parts throughout the several views. 30 In veneer machines, the knife engages the wood to cut a slice or sheet from the block or log, said knife extending across the full width of the block. In order to prevent the cutting action of the knife from developing into a splitting action, itis necessary to apply a heavy pressure to the surface of the wood adjacent to and relatively in front of thel cutting edge of the knife. In order that the action of the pressure bar, by which such pressure is applied to the'wood, may be uniform along its entire length, it is necessary that it be made very strong and stiffl in the plane of the pressure.Y Until recently the only form of pressure bar which could be made strong enough to apply a uniform and effective pressure across the entire widthv of the block, had a slightly rounded fixed nose, but I have devised means whereby the nose ,E may have a rolling contact with the wood. On account of the fact that such Contact the cavity y5.

Y nose 6.

1930. Serial No. 459,699.

must be made very close to the cutting edge i of the knife Vit is absolutely necessarythat such roller be of very small diameter and, therefore,-it must'be supported continuously for its full length. Now, the wood only 55.;

engages a small area of the roller while the bearing blocks, whichare mounted in the strong, stiff bar and which support and give the required backing forv the roller, engage from two-thirds to three-quartersof its sur 60 face, hence it` is evidentthat the coeflicient of friction of the 'bearing blocks must ,be relatively lowin comparison with that ofthe woodin order that the roller may be turned without` externalaid or with aslow a icon 65 sumption of additional power as is possible. Under'some conditions it is `preferable to have the roller, or pressure contactmember, rotated' by yan independent means but,.as aV rule, such auxiliary power .may be eliminated if the friction between the roller and the supporting bearing blocks may be `reduced sufficiently. Thepurpose of this invention is to applya lubricant to the bearing blocks-in such manner-that the entire-' length of the roller is equally and uniformly lubricated. f l

Referring to the drawings, the main strongback member l is provided with a head 2 'in which two slots 3 and t extend the full length 80 of the bar l. Theslot 3 is horizontal and the slot 4- is inclinedat about forty-five degrees upward and towards ythe rear. Both'slots 3 and 4 leadbackward froma cavity 5 formedl in the eXtreme forward edge of the head 2. The rotary nose 6 is' vsupported in said cavityV 5 by means of two bearing blocks. y y In the form shown in Figs. l, the bearing blocks 7 lie in the slot 3 and the bearing blocks 8 lie inthe slots 4. These bearing blocks 7 90 and 8 are provided withconcaved front edges in which the rotary nose 6 lies.4 Y The two said blocks 7 and 8 are separated by a portion of y Oil is introduced into the cavity 5, between the bearing blocks 7 and 8 and therefore contacts 'directly with the surface of the rotary I prefer to supply the` oil by any suitable n means, such as the handpuinp 9 from the 1 reservoir 10, to a line pipe 11 which connects, at suitable intervals in the length of the bar 1, with passages 12 through the said bar. Other pipes 13 connect the lower ends of the passages 12 with ducts 14, made in the lower bearing block 7 and leading direct into the cavity 5 between the bearing blocks 7 and `8. Each pipe 13 passes loosely through a hole in the lower part of the head 2 and screws into the block 7, thus permitting the said block to be adjusted by means of its backing screws 15.

In the form shown in Fig. 2, the rotary nose 6 is mounted in a compound bearing block positioned in the low-er horizontal slot 3. This bear-ing block comprises a main block 16, from which the upper front lportion has been cut away, with a supplemental block 17 fitted in said cut yportion and receiving its pressure from the rear part of the main block 16.` These two blocks are concaved-grooved at their outer edges to receive the rotary nose 6 between them. The pipe 13, above -described, screws into the rear ofthe block 16 and connects with a duct 18 leading therefrom Yto the space 19 between the said blocks.

.The ends `of the cavity 5, in the form illustrated in Fig. 1, orthev space 19, in the form illustrated in Fig. 2,1may be closed by means of a plug 2O of felt, or by' any other suitable means.-

Thus it will be seen thatmy lubricating means permits-the effective lubrication of the rotary nose 6 throughout its entire length, with substantially uniform effect, and that therefore the friction of the nose on the metal bearing blocks, in spite of the very high vpressure transmitted to said nose, is substantially less than theV friction between the nose and the wood bein-g cut, for, though some lubricant maybe interposed between the-wood and the nose, the wood itself-is dry and thev friction between it and the nose is not materially reduced.

VHaving described my invention, what I claim is Y Y 1. In a pressure bar for veneer machines, a

main bar; a rotary nose; a plurality of separated complementary bearing blocks supported in said main bar Vand together supporti-ng the rotary nose betweenn them; and means for supplying a lubricant in the space between sai-d bearing blocks.

2. In a pressure bar for ven-eer machines, L

main bar; a rotary nose; a plurality of separated complementary bearingv blocks mounted in Said ,main bar and together supporting the rotary nose between'them; a lubricating passage in one said block and leading to the space between Said Complementary blQCkS;

and mea-.111s to Supply. a lubricant through said,

passage to the space between said complementary bleks- 3. la ,a @essere bar ier. veneer machines@ said pipe.

GIQRGE H. OSGOOD.

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